132 Apolling group recently conducted a survey asking adults across the United States about music preferences When asked 80 of the 571 participants download music weekly a Create a 99 percent confidence interval for the true proportion of American adults who download music weekly b This survey was conducted through automated telephone interviews on May 6 and 7 2013 The error bound of the survey compensates for sampling error or natural variability among samples List some factors that could affect the survey s outcome that are not covered by the margin of error c Without performing any calculations describe how the confidence interval would change if the confidence level decreased from 99 percent to 90 percent ampus to learn about the political awareness of students